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How to Avoid Key Fob Replacement Costs Key fobs can be convenient, but they also pose issues. It is important to maintain these devices to avoid costly repairs or replacements. The most frequent cause of fob problems is battery failure. The most cost-effective solution to this problem is to replace the batteries. It is possible to do this at any hardware store or even big-box retailers. Replacement Batteries If you've noticed that your key fob requires several clicks to lock or unlock your car, or if there are other signs of a battery that is not functioning prop